Adding an invalid tag to a topic creates a whisper post

[tvavrda (Tomas Vavrda)]

Not sure if it is technically related but I also found another whisper related issue before.

Changing a tag when "tracked" puts it to Unread for the current user

Repro steps: Turn on this setting [The image shows instructions for creating a post or a whisper post when a topic's category or tags change, requiring whisper posts to be enabled. (Captioned by AI)] Change a tag of a topic (add/remove) The whisper post is created as expected [A screenshot showing a user named "tvavrda" labeled as "al" with an added proposal, featuring various icons and a message sent 8 minutes ago. (Captioned by AI)] Go to the homepage Sometimes you need to refresh the brow…